package com.hejing.cloud.mygateway;

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.lang.annotation.Annotation;

/**
 * ClassName: MyGlobalFilter
 * Package: com.hejing.cloud.mygateway
 * Description:
 *      自定义全局过滤器
 * @Author: HeJing
 * @Create: 2024-08-05 21:50
 * @Version: 1.0
 */
@Component
@Slf4j
public class MyGlobalFilter implements GlobalFilter, Ordered {
    public static final String BEGIN_VISIT_TIME = "begin_visit_time";  // 开始调用方法的时间


    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 先记录下访问接口的开始时间
        exchange.getAttributes().put(BEGIN_VISIT_TIME, System.currentTimeMillis());

        // 返回统计的各个结果给后台
        return chain.filter(exchange).then(Mono.fromRunnable(() -> {
            Long beginVisitTime = exchange.getAttribute(BEGIN_VISIT_TIME);
            if (beginVisitTime != null) {
                log.info("访问接口主机：" + exchange.getRequest().getURI().getHost());
                log.info("访问接口端口：" + exchange.getRequest().getURI().getPort());
                log.info("访问接口URL：" + exchange.getRequest().getURI().getPath());
                log.info("访问接口URL后面的参数：" + exchange.getRequest().getURI().getRawQuery());
                log.info("访问接口时长：" + (System.currentTimeMillis() - beginVisitTime) + "毫秒");
                log.info("=============================分割线================================");
                System.out.println();
            }
        }));
    }

    /**
     * 数值越小优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}



























